The students were taking graduation photos on the sports ground, ______ school uniforms.

The World No Car Day is ________ September 22nd.–Yes, many volunteers ride along the street to ask people to stop car.

Not all advertisements on TV are shown for _____ purposes; some are meant to educate people to pay attention to health, environment or safety.

Her speech made a great impression ________ the audience.[ ]

Science is developing fast. Scientists and doctors will surely find a way to _________ AIDS some day.